The deterministic condition for the ground reaction force acting point on the combined knee valgus and tibial internal rotation moments in early phase of cutting maneuvers in female athletes  

作　　者：Issei Ogasawara Ken Ohta Gajanan S.Revankar Shoji Konda Yohei Shimokochi Hideyuki Koga Ken Nakata 

机构地区：[1]Department of Health and Sport Sciences,Graduate School of Medicine,Osaka University,Toyonaka 560-0043,Japan [2]Sports Sensing Co.,LTD.,Fukuoka 815-0035,Japan [3]Department of Neurology,Graduate School of Medicine,Osaka University,Suita 565-0871,Japan [4]Department of Health and Sport Management,Osaka University of Health and Sport Sciences,Sennan-gun 590-0496,Japan [5]Department of Joint Surgery and Sports Medicine,Graduate School of Medical and Dental Sciences,Tokyo Medical and Dental University,Bunkyo-ku 113-8519,Japan

出　　处：《Journal of Sport and Health Science》2024年第3期376-386,共11页运动与健康科学（英文）

基　　金：supported by the Grant-in-Aid for Young Scientists(B)Project(Grant No.24700716)funded by the Ministry of Education,Culture,Sports,Science and Technology,Japan.

摘　　要：Background:Combined knee valgus and tibial internal rotation(VL+IR)moments have been shown to stress the anterior cruciate ligament(ACL)in several in vitro cadaveric studies.To utilize this knowledge for non-contact ACL injury prevention in sports,it is necessary to elucidate how the ground reaction force(GRF)acting point(center of pressure(CoP))in the stance foot produces combined knee VL+IR moments in risky maneuvers,such as cuttings.However,the effects of the GRF acting point on the development of the combined knee VL+IR moment in cutting are still unknown.Methods:We first established the deterministic mechanical condition that the CoP position relative to the tibial rotational axis differentiates the GRF vector’s directional probability for developing the combined knee VL+IR moment,and theoretically predicted that when the CoP is posterior to the tibial rotational axis,the GRF vector is more likely to produce the combined knee VL+IR moment than when the CoP is anterior to the tibial rotational axis.Then,we tested a stochastic aspect of our theory in a lab-controlled in vivo experiment.Fourteen females performed 60˚cutting under forefoot/rearfoot strike conditions(10 trials each).The positions of lower limb markers and GRF data were measured,and the knee moment due to GRF vector was calculated.The trials were divided into anterior-and posterior-CoP groups depending on the CoP position relative to the tibial rotational axis at each 10 ms interval from 0 to 100 ms after foot strike,and the occurrence rate of the combined knee VL+IR moment was compared between trial groups.Results:The posterior-CoP group showed significantly higher occurrence rates of the combined knee VL+IR moment(maximum of 82.8%)at every time point than those of the anterior-CoP trials,as theoretically predicted by the deterministic mechanical condition.Conclusion:The rearfoot strikes inducing the posterior CoP should be avoided to reduce the risk of non-contact ACL injury associated with the combined knee VL+IR stress.

关 键 词：Center of pressure Deterministic condition Foot strike pattern Injury mechanism Moment of ground reaction force 

分 类 号：G804.2[文化科学—运动人体科学] R873[文化科学—体育学]